Nikkei 225: Japan's benchmark stock index, live
The Nikkei 225 is the headline number for the Japanese stock market - the figure that scrolls across screens in Tokyo and around the world whenever people ask how Japan's economy is doing. The live TradingView chart above tracks the index in real time, so you can watch it react to the value of the yen, decisions from the Bank of Japan, and shifts in global demand for technology and cars. This page explains what the Nikkei 225 actually measures, why the yen matters so much to it, what tends to move it, and how to read the chart for yourself.
What the Nikkei 225 is
The Nikkei 225 is a stock market index made up of 225 large, liquid, publicly traded companies listed on the Tokyo Stock Exchange. It spans a wide range of sectors - technology, autos, machinery, retail, banking, and more - and is widely regarded as the main benchmark for Japanese equities. It was first published in 1950 and has been maintained since 1970 by the Nihon Keizai Shimbun, the financial newspaper known as Nikkei, which is where the index gets its name.
One feature sets the Nikkei apart from most modern indices: it is price-weighted, not market-cap-weighted. That means a company's influence depends on its share price rather than its total market value. A stock that trades at a high price per share can sway the index far more than a much larger company whose shares simply happen to be cheaper. This quirk is worth remembering, because it means a handful of high-priced names can drive big daily moves. For a broader, cap-weighted picture of Japan, traders often look to the TOPIX index alongside the Nikkei.
An export-tilted index
Many of the biggest Nikkei members earn a large share of their revenue overseas. Carmakers, electronics firms, and industrial-machinery makers sell to the United States, China, and Europe far more than to Japan alone. That export tilt is central to how the index behaves: when global demand is strong, Japanese earnings rise; when foreign demand cools, profits can come under pressure quickly. It also makes the index sensitive to trade tensions and tariffs, since so much of its earnings power sits outside Japan.
The crucial link to the yen
If there is one relationship that defines the Nikkei 225, it is the link to the Japanese yen. Because so many constituents are exporters, the index tends to move inversely to the currency: a weaker yen often lifts the Nikkei, while a stronger yen tends to weigh on it.
The mechanism is straightforward. When a company like Toyota or a machinery maker like Komatsu earns dollars or euros abroad and converts them back into yen, a weaker yen means those foreign revenues translate into more yen - fatter profit margins without any change in the underlying business. A stronger yen does the reverse, shrinking the home-currency value of overseas sales. This is why a sharp move in the dollar-yen exchange rate can shift the whole index within minutes. You can watch the currency side of this story on the USD/JPY page.
Bank of Japan policy
Sitting behind the yen is the Bank of Japan, the country's central bank. Its interest-rate and monetary-policy decisions are among the most powerful forces acting on the Nikkei. Very loose policy and low rates tend to weaken the yen, which supports exporters and often lifts the index. When the BoJ tightens - raising rates or signalling that easy money is ending - the yen tends to strengthen, which can pull the Nikkei lower even if the broader economy is healthy. After many years of near-zero and negative rates, a gradual move toward higher rates has made BoJ meetings a major event for the index, and traders watch them closely for both the rate decision and the bank's tone.
What moves the Nikkei 225
The yen. The dollar-yen rate is the single most-watched driver. A weaker yen generally supports the index; a stronger yen tends to pressure it.
Bank of Japan policy. Rate decisions and policy signals move the yen and, through it, the whole index. Tightening tends to be a headwind, easing a tailwind.
Global tech and auto demand. Because the index leans on exporters, demand for semiconductors, electronics, and vehicles in the US, China, and Europe feeds directly into earnings expectations.
Global risk sentiment. As a major world market, the Nikkei often takes its cue from Wall Street overnight and from broad swings in risk appetite, trade policy, and geopolitics.
How to read the chart
Start with the timeframe. A weekly or daily view shows the broad trend, while an intraday view captures the reaction to fresh news - a BoJ statement, a sharp move in the yen, or a strong session on US tech. Note the levels where the index has repeatedly turned in the past; those support and resistance zones often matter again. Keep an eye on volatility around major events, which tends to spike on central-bank days and big currency moves. For extra context, pull up USD/JPY alongside the Nikkei to see the yen link in action, or browse all markets to compare Japan with other indices, currencies, and commodities.
Frequently asked questions
What is the Nikkei 225?
It is the main benchmark index for the Japanese stock market, made up of 225 large, liquid companies listed on the Tokyo Stock Exchange. It is price-weighted and has been published since 1950, maintained by the Nikkei financial newspaper.
Why does a weaker yen usually lift the Nikkei?
Many Nikkei companies are exporters that earn money abroad. A weaker yen means those foreign revenues convert into more yen, boosting profits and margins. A stronger yen does the opposite, which is why the index tends to move inversely to the currency.
How is the Nikkei 225 weighted?
It is price-weighted, so a company's influence depends on its share price rather than its total market value. High-priced stocks can sway the index more than larger companies with cheaper shares - different from most cap-weighted indices.
How does the Bank of Japan affect the index?
The BoJ sets interest rates and monetary policy, which strongly influence the yen. Loose policy tends to weaken the yen and support the Nikkei, while tightening tends to strengthen the yen and act as a headwind for the index.
What moves the Nikkei 225 day to day?
The biggest drivers are the dollar-yen exchange rate, Bank of Japan policy, global demand for technology and autos, and broad risk sentiment - including how Wall Street performed overnight.
What is the difference between the Nikkei and the TOPIX?
The Nikkei 225 tracks 225 selected companies and is price-weighted, so high-priced shares dominate. The TOPIX covers a much broader set of Tokyo-listed stocks and is market-cap-weighted, giving a fuller view of the overall market.
This article is for informational purposes only and is not investment advice. Index levels can be volatile and past performance does not guarantee future results. Do your own research before making any financial decision.